Authors: Amit X Garg; Aizhan Meirambayeva; Anjie Huang; Joseph Kim; G V Ramesh Prasad; Greg Knoll; Neil Boudville; Charmaine Lok; Philip McFarlane; Martin Karpinski; Leroy Storsley; Scott Klarenbach; Ngan Lam; Sonia M Thomas; Christine Dipchand; Peter Reese; Mona Doshi; Eric Gibney; Ken Taub; Ann Young Journal: BMJ Date: 2012-03-01